package com.lj.framework.interceptor.impl;

import cn.hutool.core.text.CharSequenceUtil;
import cn.hutool.core.util.ObjectUtil;
import com.alibaba.fastjson.JSONObject;
import com.google.common.collect.Maps;
import com.lj.common.annotation.repeat.RepeatSubmit;
import com.lj.common.constant.BaseConstant;
import com.lj.common.core.redis.RedisCache;
import com.lj.common.filter.RepeatedlyRequestWrapper;
import com.lj.common.utils.HttpHelper;
import com.lj.framework.interceptor.RepeatSubmitInterceptor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 判断请求url和数据是否和上一次相同，
 * 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 *
 * @author 小李飞刀
 */
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {

    public static final String REPEAT_PARAMS = "repeatParams";

    public static final String REPEAT_TIME = "repeatTime";

    /**
     * 令牌自定义标识
     */
    @Value("${token.header}")
    private String header;

    @Resource
    private RedisCache<String, Map<String, Object>> redisCache;

    @Override
    public boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation) {
        String nowParams = "";
        if (request instanceof RepeatedlyRequestWrapper) {
            RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
            nowParams = HttpHelper.getBodyString(repeatedlyRequest);
        }

        // body参数为空，获取Parameter的数据
        if (CharSequenceUtil.isEmpty(nowParams)) {
            nowParams = JSONObject.toJSONString(request.getParameterMap());
        }
        Map<String, Object> nowDataMap = Maps.newHashMap();
        nowDataMap.put(REPEAT_PARAMS, nowParams);
        nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());

        // 请求地址（作为存放cache的key值）
        String url = request.getRequestURI();

        // 唯一值（没有消息头则使用请求地址）
        String submitKey = request.getHeader(header);
        if (CharSequenceUtil.isEmpty(submitKey)) {
            submitKey = url;
        }

        // 唯一标识（指定key + 消息头）
        String cacheRepeatKey = BaseConstant.REPEAT_SUBMIT_KEY + submitKey;
        Map<String, Object> sessionMap = redisCache.getCacheObject(cacheRepeatKey);
        if (ObjectUtil.isNotNull(sessionMap) && sessionMap.containsKey(url) && sessionMap.get(url) instanceof Map) {
            final Map<?, ?> preDataMap = (Map<?, ?>) sessionMap.get(url);
            if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap, annotation.interval())) {
                return true;
            }
        }
        Map<String, Object> cacheMap = Maps.newHashMap();
        cacheMap.put(url, nowDataMap);
        redisCache.setCacheObject(cacheRepeatKey, cacheMap, annotation.interval(), TimeUnit.MILLISECONDS);
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, Object> nowMap, Map<?, ?> preMap) {
        String nowParams = (String) nowMap.get(REPEAT_PARAMS);
        String preParams = (String) preMap.get(REPEAT_PARAMS);
        return nowParams.equals(preParams);
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, Object> nowMap, Map<?, ?> preMap, int interval) {
        long time1 = (Long) nowMap.get(REPEAT_TIME);
        long time2 = (Long) preMap.get(REPEAT_TIME);
        return (time1 - time2) < interval;
    }
}